Semantic Web Activity News http://www.w3.org/blog/SW 2012-01-12T16:03:44Z hourly 1 2000-01-01T12:00+00:00 Drafts Published by the W3C HTML Data Task Force: HTML Data Guide and Microdata to RDF transform http://www.w3.org/blog/SW/2012/01/12/drafts-published-by-the-w3c-html-data-task-force-html-data-guide-and-microdata-to-rdf-transform/ 2012-01-12T16:03:44Z Ivan Herman The HTML Data Task Force of the W3C Semantic Web Interest Group has published two documents today: The HTML Data Guide aims to help publishers and consumers of HTML data. With several syntaxes (microformats, microdata, RDFa) and vocabularies (schema.org, Dublin … Continue reading → The HTML Data Task Force of the W3C Semantic Web Interest Group has published two documents today:

  • The HTML Data Guide aims to help publishers and consumers of HTML data. With several syntaxes (microformats, microdata, RDFa) and vocabularies (schema.org, Dublin Core, microformat vocabularies, etc.) to choose from, it provides guidance on deciding what to choose in a way that meets the publisher’s or consumer’s needs.
  • The Microdata to RDF describes processing rules that may be used to extract RDF from an HTML document containing microdata.

Both documents are Working Drafts, with the goal of publishing a final version as Interest Group Notes. Comments and feedbacks are welcome; please send them to the public-html-data-tf@w3.org mailing list.

]]> Feedback Welcome: An Overview of the Provenance (PROV) family of specs http://www.w3.org/blog/SW/2012/01/11/feedback-welcome-an-overview-of-the-provenance-prov-family-of-specs/ 2012-01-11T18:56:56Z Paul Groth Knowing how, where, when and why content was produced is an important part of making a trustworthy web. However, it is often difficult to interchange this provenance information between systems. For example, it’s often difficult to locate or find provenance … Continue reading → Knowing how, where, when and why content was produced is an important part of making a trustworthy web. However, it is often difficult to interchange this provenance information between systems. For example, it’s often difficult to locate or find provenance information for a web page. Even if the provenance information is located, it is often only available as text or if it is available in a structured way it does not use a common terminology — making it difficult to create software that can leverage this information.

The Provenance Working Group was charted to help address these limitations. The group has been working diligently to create a family of specifications (called PROV) that allow for the interchange of provenance. The group is looking for your feedback. This post provides an overview of the various working drafts that have been published and should help you find your way around.

The set of specs at this point addresses two aspects of provenance interoperability introduced above:

  • provenance access
  • provenance representation

PROV-AQ: Provenance Access and Query addresses how to both make available and retrieve provenance information for Web resources. The document specifies how to use existing Web technologies such as HTTP, link headers, and SPARQL to accomplish this. Where possible the specification attempts to be agnostic the format of the provenance being accessed.

Once some provenance is obtained, it is important for the information to be understandable in a machine interpretable fashion. The Working Group has defined a data model (PROV-DM) that provides facilities for representing the entities, people and activities involved in producing a piece of data or thing in the world. The data model is domain-agnostic and has well defined extensibility points. Importantly, the data model has a corresponding OWL ontology (PROV-O) that encodes the PROV-DM. PROV-O is envisioned to specify the serialization for exchanging provenance information.

To help orient users of PROV-O and PROV-DM, the working group has developed a primer (PROV-Primer) that introduces the core constructs of the data model and provides examples using PROV-O. It is recommended that users and reviewers of the specification begin with the primer before moving to the ontology or data model.

The group is looking for feedback of all types: Would you expose provenance using PROV-AQ? Can you represent your provenance information using the PROV-O data model? Does PROV-O integrate well with your Linked Data or other Semantic Web infrastructure?

Let us know what you think.

The PROV family of specifications:

Paul Groth and Luc Moreau on behalf of the PROV-WG
]]> Provenance Access and Query and Provenance Primer Documents published http://www.w3.org/blog/SW/2012/01/10/provenance-access-and-query-and-provenance-primer-documents-published/ 2012-01-10T15:59:46Z Ivan Herman The W3C Provenance Working Group has published two new documents: The “Provenance Access and Query” document specifies how to use standard Web protocols, including HTTP, to obtain information about the provenance of Web resources. The “Provenance Primer” provides an intuitive … Continue reading → The W3C Provenance Working Group has published two new documents:

Both documents are First Public Working Drafts; feedbacks and comments are welcome! Please, use the public-prov-comments@w3.org mailing list to provide your comments.

]]> Publication of the SPARQL 1.1 2nd Last Call Working Drafts http://www.w3.org/blog/SW/2012/01/06/publication-of-the-sparql-1-1-2nd-last-call-working-drafts/ 2012-01-06T12:51:31Z Ivan Herman The W3C SPARQL Working Group has published the (second) Last Call Working Drafts of the following SPARQL 1.1 documents: SPARQL 1.1 Update defines an update language for RDF graphs. SPARQL 1.1 Service Description defines a vocabulary and discovery mechanism for … Continue reading → The W3C SPARQL Working Group has published the (second) Last Call Working Drafts of the following SPARQL 1.1 documents:

  • SPARQL 1.1 Update defines an update language for RDF graphs.
  • SPARQL 1.1 Service Description defines a vocabulary and discovery mechanism for describing the capabilities of a SPARQL endpoint.
  • SPARQL 1.1 Query Language adds support for aggregates, subqueries, projected expressions, and negation to the SPARQL query language.
  • SPARQL 1.1 Protocol describes a means for conveying SPARQL queries and updates to a SPARQL processing service and returning the results via HTTP to the entity that requested them.
  • SPARQL 1.1 Entailment Regimes defines conditions under which SPARQL queries can be used with entailment regimes such as RDF, RDF Schema, OWL, or RIF.

Review comments are welcome through 6 February; please use the dedicated mailing list: public-sparql-dev@w3.org.

]]> New Versions of RDFa Core 1.1 and the XHTML+RDFa 1.1 Drafts http://www.w3.org/blog/SW/2011/12/16/new-versions-of-rdfa-core-1-1-and-the-xhtmlrdfa-1-1-drafts/ 2011-12-16T09:33:52Z Ivan Herman The RDF Web Applications Working Group has published a Working Draft of RDFa Core 1.1, a specification for attributes to express structured data in any markup language. The group also published an update to XHTML+RDFa 1.1, a Host Language for … Continue reading → The RDF Web Applications Working Group has published a Working Draft of RDFa Core 1.1, a specification for attributes to express structured data in any markup language. The group also published an update to XHTML+RDFa 1.1, a Host Language for RDFa Core 1.1. This document is intended for authors who want to create XHTML Family documents that embed rich semantic markup.

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]]> New Version of the PROV Data Model Draft http://www.w3.org/blog/SW/2011/12/16/new-version-of-the-prov-data-model-draft/ 2011-12-16T09:27:49Z Ivan Herman The Provenance Working Group has published a new Working Draft of The PROV Data Model and Abstract Syntax Notation. Provenance of information is crucial in deciding whether information is to be trusted, how it should be integrated with other diverse … Continue reading → The Provenance Working Group has published a new Working Draft of The PROV Data Model and Abstract Syntax Notation. Provenance of information is crucial in deciding whether information is to be trusted, how it should be integrated with other diverse information sources, and how to give credit to its originators when reusing it. In an open and inclusive environment such as the Web, users find information that is often contradictory or questionable: provenance can help those users to make trust judgments. PROV-DM is a data model for provenance for building representations of the entities, people and activities involved in producing a piece of data or thing in the world.

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]]> First Public Working Draft of the PROV Ontology published http://www.w3.org/blog/SW/2011/12/13/first-public-working-draft-of-the-prov-ontology-published/ 2011-12-13T17:33:05Z Ivan Herman The W3C Provenance Working Group has published the First Public Working Draft of The PROV Ontology: Model and Formal Semantics. The PROV Ontology (also known as PROV-O) encodes the PROV Data Model in the OWL2 Web Ontology Language (OWL2). The … Continue reading → The W3C Provenance Working Group has published the First Public Working Draft of The PROV Ontology: Model and Formal Semantics. The PROV Ontology (also known as PROV-O) encodes the PROV Data Model in the OWL2 Web Ontology Language (OWL2). The PROV ontology consists of a set of classes, properties, and restrictions that can be used to represent provenance information. The PROV ontology can also be specialized to create new classes and properties for modeling provenance information specific to different domain applications. The PROV ontology supports a set of entailments based on OWL2 formal semantics and provenance specific inference rules. The PROV ontology is available for download as a separate OWL2 document.

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]]> RDFa Lite 1.1 Draft Published; RDFa 1.1 Primer Updated http://www.w3.org/blog/SW/2011/12/09/rdfa-lite-1-1-draft-published-rdfa-1-1-primer-updated/ 2011-12-09T08:06:51Z Ivan Herman The RDF Web Applications Working Group has published the First Public Working Draft for RDFa Lite 1.1 and an updated Working Draft for the RDFa 1.1 Primer. One critique of RDFa is that is has too much functionality, leaving first-time … Continue reading → The RDF Web Applications Working Group has published the First Public Working Draft for RDFa Lite 1.1 and an updated Working Draft for the RDFa 1.1 Primer.

One critique of RDFa is that is has too much functionality, leaving first-time authors confused about the more advanced features. RDFa Lite is a minimalist version of RDFa that helps authors easily jump into the structured data world. The goal was to outline a small subset of RDFa that will work for 80% of the Web authors out there doing simple data markup.

The RDFa Primer is a more in-depth introduction to RDFa and all of the structured data markup features that it provides.

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]]> Call for Review: Ontology for Media Resources 1.0 Proposed Recommendation Published http://www.w3.org/blog/SW/2011/12/04/call-for-review-ontology-for-media-resources-1-0-proposed-recommendation-published/ 2011-12-04T09:16:23Z Ivan Herman The W3C Media Annotations Working Group has published a Proposed Recommendation of Ontology for Media Resources 1.0. This document defines the Ontology for Media Resources 1.0. The term “Ontology” is used in its broadest possible definition: a core vocabulary. The … Continue reading → The W3C Media Annotations Working Group has published a Proposed Recommendation of Ontology for Media Resources 1.0. This document defines the Ontology for Media Resources 1.0. The term “Ontology” is used in its broadest possible definition: a core vocabulary. The intent of this vocabulary is to bridge the different descriptions of media resources, and provide a core set of descriptive properties. This document defines a core set of metadata properties for media resources, along with their mappings to elements from a set of existing metadata formats. Besides that, the document presents a Semantic Web compatible implementation of the abstract ontology using RDF/OWL. The document is mostly targeted towards media resources available on the Web, as opposed to media resources that are only accessible in local repositories. Comments are welcome through 31 December.

]]> Japanese Translation of SKOS Primer http://www.w3.org/blog/SW/2011/11/24/japanese-translation-of-skos-primer/ 2011-11-24T11:01:07Z Ivan Herman Shuji Kamitsuna (上綱 秀治) has published a Japanese translation of the SKOS Primer document, under the title “SKOS入門”. Shuji Kamitsuna (上綱 秀治) has published a Japanese translation of the SKOS Primer document, under the title “SKOS入門”.

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